Yes done that and updated all dongles and controller software.
see attached network
so your saying they are no better in a network then when they were not set up?
They can receive voltage, current and temperature data supplied from VE.Smart sources like a SBS, BMV-712 or smartshunt, which is very valuable, and it's arguably vastly more beneficial than synch charging.
Synchronized charging is not particularly beneficial. It's mostly a placebo/OCD satisfaction issue. It won't produce any more total harvest except in very rare cases, and when it does, it's the cases where you're getting a small % improvement on a crappy number because solar conditions are crappy.
Victron is pretty good about listing limitations in a dedicated section in their manuals. Always worth checking.
IMHO, if you bought these to get synch charging, it was a waste of time and $ even if they worked.
I wouldn't sweat the voltage deviation. Victron MPPT are only about 1% accurate, and it's made worse by the fact that the voltage they measure is influenced by the current. More current usually means higher voltage. To get a better feel for their accuracy/consistency, check them when they are no longer producing power.
With an SBS, they would receive identical voltage readings measured by the SBS - no voltage drop would occur, and they would register the same voltage (not necessarily on the summary screen), they would also receive temperature data - useful for low temp charge protection or lead-acid temperature compensation.
With a shunt, you also get actual battery current, which is far more important than sync charging. The chargers base the tail current on the ACTUAL current going into the battery rather than the current the MPPT is producing.
The cheapest path to all three is the smartshunt with a temperature sensor.
